public void Chk(byte[] wiki_domain, Io_url css_fil) {
   this.wiki_domain = wiki_domain;
   List_adp img_list = List_adp_.New();
   byte[] old_bry = Io_mgr.Instance.LoadFilBry(css_fil);
   byte[] rel_url_prefix = Bry_.Add(Bry_fwd_slashes, wiki_domain);
   byte[] new_bry = Convert_to_local_urls(rel_url_prefix, old_bry, img_list);
   Io_url img_dir = css_fil.OwnerDir();
   Download_fils(img_dir, img_list.To_str_ary());
   Io_mgr.Instance.SaveFilBry(css_fil, new_bry);
 }